diff --git a/docs/release/release_notes.md b/docs/release/release_notes.md
index 669cf46d9f0e9b930fc500a99ed6cce0b7b2fc74..b8c294906ddb5a51479afd627ea29e982f4b1498 100644
--- a/docs/release/release_notes.md
+++ b/docs/release/release_notes.md
@@ -1,3 +1,12 @@
+## Release 6.3.1
+
+* Add crm-error class to stripe card errors block so it is highlighted on non bootstrap themes
+* Fix Stripe.ipn API when working with charge.captured/succeeded
+* Update documentation to mention contributiontransactlegacy extension
+* [#147](https://lab.civicrm.org/extensions/stripe/issues/147) Add workaround and set required billing fields via jquery
+* [#153](https://lab.civicrm.org/extensions/stripe/issues/153) Support multiple participant registration and CiviDiscount with zero amount.
+* Fix non-stripe submit check - if amount is zero.
+
 ## Release 6.3
 **This release REQUIRES that you upgrade mjwshared to 0.6 and your Stripe API version to 2019-12-03.**
 
diff --git a/info.xml b/info.xml
index 2d7c2bb8c5c65d1f623edee34f9fcf745b9a567a..d979a22057fdc05bd69e7b370866c2b9c02c817d 100644
--- a/info.xml
+++ b/info.xml
@@ -13,9 +13,9 @@
     <author>Matthew Wire (MJW Consulting)</author>
     <email>mjw@mjwconsult.co.uk</email>
   </maintainer>
-  <releaseDate>2020-01-14</releaseDate>
-  <version>6.3.1.alpha</version>
-  <develStage>alpha</develStage>
+  <releaseDate>2020-01-15</releaseDate>
+  <version>6.3.1</version>
+  <develStage>stable</develStage>
   <compatibility>
     <ver>5.19</ver>
   </compatibility>
diff --git a/js/civicrm_stripe.min.js b/js/civicrm_stripe.min.js
index b22a7e388d4d15a8fe28ebd7ebfc2751ce9ec872..b00195fa3601ecb083a3a9b8d19d05655e7dc7ac 100644
--- a/js/civicrm_stripe.min.js
+++ b/js/civicrm_stripe.min.js
@@ -1 +1 @@
-CRM.$(function(c){e("civicrm_stripe loaded, dom-ready function firing.");if(window.civicrmStripeHandleReload){e("calling existing civicrmStripeHandleReload.");window.civicrmStripeHandleReload();return}var p;var a;var b;var t;var n=false;window.onbeforeunload=null;window.civicrmStripeHandleReload=function(){e("civicrmStripeHandleReload");var B=document.getElementById("card-element");if((typeof B!=="undefined")&&(B)){if(!B.children.length){e("checkAndLoad from document.ready");l()}}};window.civicrmStripeHandleReload();function v(D,B){e(D+": success - submitting form");var C=document.createElement("input");C.setAttribute("type","hidden");C.setAttribute("name",D);C.setAttribute("value",B.id);b.appendChild(C);b.submit()}function o(){for(i=0;i<t.length;++i){t[i].setAttribute("disabled",true)}return b.submit()}function g(B){e("error: "+B.error.message);var C=document.getElementById("card-errors");C.style.display="block";C.textContent=B.error.message;document.querySelector("#billing-payment-block").scrollIntoView();window.scrollBy(0,-50);b.dataset.submitted=false;for(i=0;i<t.length;++i){t[i].removeAttribute("disabled")}}function z(){e("handle card payment");p.createPaymentMethod("card",a).then(function(B){if(B.error){g(B)}else{if(f()===true){v("paymentMethodID",B.paymentMethod)}else{var C=CRM.url("civicrm/stripe/confirm-payment");c.post(C,{payment_method_id:B.paymentMethod.id,amount:q(),currency:CRM.vars.stripe.currency,id:CRM.vars.stripe.id,description:document.title}).then(function(D){w(D)})}}})}function w(B){e("handleServerResponse");if(B.error){g(B)}else{if(B.requires_action){r(B)}else{v("paymentIntentID",B.paymentIntent)}}}function r(B){p.handleCardAction(B.payment_intent_client_secret).then(function(C){if(C.error){g(C)}else{v("paymentIntentID",C.paymentIntent)}})}c(document).ajaxComplete(function(D,E,C){if((C.url.match("civicrm(/|%2F)payment(/|%2F)form")!==null)||(C.url.match("civicrm(/|%2F)contact(/|%2F)view(/|%2F)participant")!==null)){if(typeof CRM.vars.stripe==="undefined"){return}var B=j();if(B!==null){if(B!==parseInt(CRM.vars.stripe.id)){e("payment processor changed to id: "+B);if(B===0){return k()}CRM.api3("PaymentProcessor","getvalue",{"return":"user_name",id:B,payment_processor_type_id:CRM.vars.stripe.paymentProcessorTypeID}).done(function(F){var G=F.result;if(G){e("Setting new stripe key to: "+G);CRM.vars.stripe.publishableKey=G}else{return k()}e("checkAndLoad from ajaxComplete");l()})}}}});function k(){e("New payment processor is not Stripe, clearing CRM.vars.stripe");if((typeof a!=="undefined")&&(a)){e("destroying card element");a.destroy();a=undefined}delete (CRM.vars.stripe)}function l(){if(typeof CRM.vars.stripe==="undefined"){e("CRM.vars.stripe not defined! Not a Stripe processor?");return}if(typeof Stripe==="undefined"){if(n){return}n=true;e("Stripe.js is not loaded!");c.getScript("https://js.stripe.com/v3",function(){e("Script loaded and executed.");n=false;d()})}else{d()}}function d(){e("loadStripeBillingBlock");if(typeof p==="undefined"){p=Stripe(CRM.vars.stripe.publishableKey)}var I=p.elements();var F={base:{fontSize:"20px"}};var C=document.getElementById("billing_postal_code-"+CRM.vars.stripe.billingAddressID).value;e("existing postcode: "+C);a=I.create("card",{style:F,value:{postalCode:C}});a.mount("#card-element");e("created new card element",a);if(document.getElementById("billing_postal_code-5").value){document.getElementById("billing_postal_code-5").setAttribute("disabled",true)}else{document.getElementsByClassName("billing_postal_code-"+CRM.vars.stripe.billingAddressID+"-section")[0].setAttribute("hidden",true)}a.addEventListener("change",function(J){u(J)});b=h();if(typeof b.length==="undefined"||b.length===0){e("No billing form!");return}t=A();b.dataset.submitdontprocess=false;var B=b.querySelectorAll('[type="submit"][formnovalidate="1"], [type="submit"][formnovalidate="formnovalidate"], [type="submit"].cancel, [type="submit"].webform-previous'),E;for(E=0;E<B.length;++E){B[E].addEventListener("click",H())}function H(){e("adding submitdontprocess");b.dataset.submitdontprocess=true}for(E=0;E<t.length;++E){t[E].addEventListener("click",D)}function D(J){if(b.dataset.submitted===true){return}b.dataset.submitted=true;if(typeof CRM.vars.stripe==="undefined"){return o()}e("clearing submitdontprocess");b.dataset.submitdontprocess=false;return G(J)}for(E=0;E<t.length;++E){t[E].removeAttribute("onclick")}m();if(y()){c("[type=submit]").click(function(){s(this.value)});b.addEventListener("keydown",function(J){if(J.keyCode===13){s(this.value);G(event)}});c("#billingcheckbox:input").hide();c('label[for="billingcheckbox"]').hide()}function G(L){L.preventDefault();e("submit handler");if(c(b).valid()===false){e("Form not valid");return false}if(typeof CRM.vars.stripe==="undefined"){e("Submitting - not a stripe processor");return true}if(b.dataset.submitted===true){e("form already submitted");return false}var N=parseInt(CRM.vars.stripe.id);var K=null;if(y()){if(!c('input[name="submitted[civicrm_1_contribution_1_contribution_payment_processor_id]"]').length){K=N}else{K=parseInt(b.querySelector('input[name="submitted[civicrm_1_contribution_1_contribution_payment_processor_id]"]:checked').value)}}else{if((b.querySelector(".crm-section.payment_processor-section")!==null)||(b.querySelector(".crm-section.credit_card_info-section")!==null)){N=CRM.vars.stripe.id;if(b.querySelector('input[name="payment_processor_id"]:checked')!==null){K=parseInt(b.querySelector('input[name="payment_processor_id"]:checked').value)}}}if((K===0)||(N===null)||((K===null)&&(N===null))){e("Not a Stripe transaction, or pay-later");return o()}else{e("Stripe is the selected payprocessor")}if(typeof CRM.vars.stripe.publishableKey==="undefined"){e("submit missing stripe-pub-key element or value");return true}if(b.dataset.submitdontprocess===true){e("non-payment submit detected - not submitting payment");return true}if(y()){if(c("#billing-payment-block").is(":hidden")){e("no payment processor on webform");return true}var M=c('[name="submitted[civicrm_1_contribution_1_contribution_payment_processor_id]"]');if(M.length){if(M.filter(":checked").val()==="0"||M.filter(":checked").val()===0){e("no payment processor selected");return true}}}var J=q();if(J=="0"){e("Total amount is 0");return o()}if(b.dataset.submitted===true){alert("Form already submitted. Please wait.");return false}else{b.dataset.submitted=true}for(E=0;E<t.length;++E){t[E].setAttribute("disabled",true)}z();return true}}function y(){if(b!==null){return b.classList.contains("webform-client-form")||b.classList.contains("webform-submission-form")}return false}function h(){var B=c("div#card-element").closest("form").prop("id");if((typeof B==="undefined")||(!B.length)){B=c("input[name=hidden_processor]").closest("form").prop("id")}return document.getElementById(B)}function A(){var B=null;if(y()){B=b.querySelectorAll('[type="submit"].webform-submit');if(!B){B=b.querySelectorAll('[type="submit"].webform-button--submit')}}else{B=b.querySelectorAll('[type="submit"].validate')}return B}function q(){var B=0;if((document.getElementById("additional_participants")!==null)&&(document.getElementById("additional_participants").value.length!==0)){e("We don't know the final price - registering additional participants")}else{if(document.getElementById("totalTaxAmount")!==null){B=parseFloat(x());e("Calculated amount using internal calculateTaxAmount()")}else{if(typeof calculateTotalFee=="function"){B=parseFloat(calculateTotalFee())}else{if(y()){c(".line-item:visible","#wf-crm-billing-items").each(function(){B+=parseFloat(c(this).data("amount"))})}else{if(document.getElementById("total_amount")){B=parseFloat(document.getElementById("total_amount").value)}}}}}e("getTotalAmount: "+B.toFixed(2));return B.toFixed(2)}function x(){var B=0;if(document.getElementById("totalTaxAmount")===null){return B}if(document.getElementById("totalTaxAmount").textContent.length===0){B=document.getElementById("total_amount").value}else{B=document.getElementById("totalTaxAmount").textContent.split(" ").pop()}return B}function f(){var B=false;if(y()){if(c('input[id$="contribution-installments"]').length!==0&&c('input[id$="contribution-installments"]').val()>1){B=true}}if(document.getElementById("is_recur")!==null){if(document.getElementById("is_recur").type=="hidden"){B=(document.getElementById("is_recur").value==1)}else{B=Boolean(document.getElementById("is_recur").checked)}}else{if(c('input[name="auto_renew"]').length!==0){if(c('input[name="auto_renew"]').prop("checked")){B=true}else{if(document.getElementById("auto_renew").type=="hidden"){B=(document.getElementById("auto_renew").value==1)}else{B=Boolean(document.getElementById("auto_renew").checked)}}}}e("isRecur is "+B);return B}function u(B){if(!B.complete){return}document.getElementById("billing_postal_code-"+CRM.vars.stripe.billingAddressID).value=B.value.postalCode}function m(){cividiscountElements=b.querySelectorAll("input#discountcode");var B=function(C){if(C.keyCode===13){C.preventDefault();e("adding submitdontprocess");b.dataset.submitdontprocess=true}};for(i=0;i<cividiscountElements.length;++i){cividiscountElements[i].addEventListener("keydown",B)}}function e(B){if((typeof(CRM.vars.stripe)==="undefined")||(Boolean(CRM.vars.stripe.jsDebug)===true)){console.log(new Date().toISOString()+" civicrm_stripe.js: "+B)}}function s(C){var B=null;if(document.getElementById("action")!==null){B=document.getElementById("action")}else{B=document.createElement("input")}B.setAttribute("type","hidden");B.setAttribute("name","op");B.setAttribute("id","action");B.setAttribute("value",C);b.appendChild(B)}function j(){if((typeof b==="undefined")||(!b)){b=h();if(!b){return null}}var B=b.querySelector('input[name="payment_processor_id"]:checked');if(B!==null){return parseInt(B.value)}return null}});
\ No newline at end of file
+CRM.$(function(d){g("civicrm_stripe loaded, dom-ready function firing.");if(window.civicrmStripeHandleReload){g("calling existing civicrmStripeHandleReload.");window.civicrmStripeHandleReload();return}var r;var b;var c;var v;var p=false;window.onbeforeunload=null;window.civicrmStripeHandleReload=function(){g("civicrmStripeHandleReload");var D=document.getElementById("card-element");if((typeof D!=="undefined")&&(D)){if(!D.children.length){g("checkAndLoad from document.ready");n()}}};window.civicrmStripeHandleReload();function x(F,D){g(F+": success - submitting form");var E=document.createElement("input");E.setAttribute("type","hidden");E.setAttribute("name",F);E.setAttribute("value",D.id);c.appendChild(E);c.submit()}function q(){for(i=0;i<v.length;++i){v[i].setAttribute("disabled",true)}return c.submit()}function j(D){g("error: "+D.error.message);var E=document.getElementById("card-errors");E.style.display="block";E.textContent=D.error.message;document.querySelector("#billing-payment-block").scrollIntoView();window.scrollBy(0,-50);c.dataset.submitted=false;for(i=0;i<v.length;++i){v[i].removeAttribute("disabled")}}function B(){g("handle card payment");r.createPaymentMethod("card",b).then(function(D){if(D.error){j(D)}else{if(h()||a()){x("paymentMethodID",D.paymentMethod)}else{var E=CRM.url("civicrm/stripe/confirm-payment");d.post(E,{payment_method_id:D.paymentMethod.id,amount:s().toFixed(2),currency:CRM.vars.stripe.currency,id:CRM.vars.stripe.id,description:document.title}).then(function(F){y(F)})}}})}function y(D){g("handleServerResponse");if(D.error){j(D)}else{if(D.requires_action){t(D)}else{x("paymentIntentID",D.paymentIntent)}}}function t(D){r.handleCardAction(D.payment_intent_client_secret).then(function(E){if(E.error){j(E)}else{x("paymentIntentID",E.paymentIntent)}})}d(document).ajaxComplete(function(F,G,E){if((E.url.match("civicrm(/|%2F)payment(/|%2F)form")!==null)||(E.url.match("civicrm(/|%2F)contact(/|%2F)view(/|%2F)participant")!==null)){if(typeof CRM.vars.stripe==="undefined"){return}var D=l();if(D!==null){if(D!==parseInt(CRM.vars.stripe.id)){g("payment processor changed to id: "+D);if(D===0){return m()}CRM.api3("PaymentProcessor","getvalue",{"return":"user_name",id:D,payment_processor_type_id:CRM.vars.stripe.paymentProcessorTypeID}).done(function(H){var I=H.result;if(I){g("Setting new stripe key to: "+I);CRM.vars.stripe.publishableKey=I}else{return m()}g("checkAndLoad from ajaxComplete");n()})}}}});function m(){g("New payment processor is not Stripe, clearing CRM.vars.stripe");if((typeof b!=="undefined")&&(b)){g("destroying card element");b.destroy();b=undefined}delete (CRM.vars.stripe)}function n(){if(typeof CRM.vars.stripe==="undefined"){g("CRM.vars.stripe not defined! Not a Stripe processor?");return}if(typeof Stripe==="undefined"){if(p){return}p=true;g("Stripe.js is not loaded!");d.getScript("https://js.stripe.com/v3",function(){g("Script loaded and executed.");p=false;f()})}else{f()}}function f(){g("loadStripeBillingBlock");if(typeof r==="undefined"){r=Stripe(CRM.vars.stripe.publishableKey)}var K=r.elements();var H={base:{fontSize:"20px"}};var E=document.getElementById("billing_postal_code-"+CRM.vars.stripe.billingAddressID).value;g("existing postcode: "+E);b=K.create("card",{style:H,value:{postalCode:E}});b.mount("#card-element");g("created new card element",b);e();if(document.getElementById("billing_postal_code-5").value){document.getElementById("billing_postal_code-5").setAttribute("disabled",true)}else{document.getElementsByClassName("billing_postal_code-"+CRM.vars.stripe.billingAddressID+"-section")[0].setAttribute("hidden",true)}b.addEventListener("change",function(L){w(L)});c=k();if(typeof c.length==="undefined"||c.length===0){g("No billing form!");return}v=C();c.dataset.submitdontprocess=false;var D=c.querySelectorAll('[type="submit"][formnovalidate="1"], [type="submit"][formnovalidate="formnovalidate"], [type="submit"].cancel, [type="submit"].webform-previous'),G;for(G=0;G<D.length;++G){D[G].addEventListener("click",J())}function J(){g("adding submitdontprocess");c.dataset.submitdontprocess=true}for(G=0;G<v.length;++G){v[G].addEventListener("click",F)}function F(L){if(c.dataset.submitted===true){return}c.dataset.submitted=true;if(typeof CRM.vars.stripe==="undefined"){return q()}g("clearing submitdontprocess");c.dataset.submitdontprocess=false;return I(L)}for(G=0;G<v.length;++G){v[G].removeAttribute("onclick")}o();if(A()){d("[type=submit]").click(function(){u(this.value)});c.addEventListener("keydown",function(L){if(L.keyCode===13){u(this.value);I(event)}});d("#billingcheckbox:input").hide();d('label[for="billingcheckbox"]').hide()}function I(N){N.preventDefault();g("submit handler");if(d(c).valid()===false){g("Form not valid");document.querySelector("#billing-payment-block").scrollIntoView();window.scrollBy(0,-50);return false}if(typeof CRM.vars.stripe==="undefined"){g("Submitting - not a stripe processor");return true}if(c.dataset.submitted===true){g("form already submitted");return false}var P=parseInt(CRM.vars.stripe.id);var M=null;if(A()){if(!d('input[name="submitted[civicrm_1_contribution_1_contribution_payment_processor_id]"]').length){M=P}else{M=parseInt(c.querySelector('input[name="submitted[civicrm_1_contribution_1_contribution_payment_processor_id]"]:checked').value)}}else{if((c.querySelector(".crm-section.payment_processor-section")!==null)||(c.querySelector(".crm-section.credit_card_info-section")!==null)){P=CRM.vars.stripe.id;if(c.querySelector('input[name="payment_processor_id"]:checked')!==null){M=parseInt(c.querySelector('input[name="payment_processor_id"]:checked').value)}}}if((M===0)||(P===null)||((M===null)&&(P===null))){g("Not a Stripe transaction, or pay-later");return q()}else{g("Stripe is the selected payprocessor")}if(typeof CRM.vars.stripe.publishableKey==="undefined"){g("submit missing stripe-pub-key element or value");return true}if(c.dataset.submitdontprocess===true){g("non-payment submit detected - not submitting payment");return true}if(A()){if(d("#billing-payment-block").is(":hidden")){g("no payment processor on webform");return true}var O=d('[name="submitted[civicrm_1_contribution_1_contribution_payment_processor_id]"]');if(O.length){if(O.filter(":checked").val()==="0"||O.filter(":checked").val()===0){g("no payment processor selected");return true}}}var L=s();if(L===0){g("Total amount is 0");return q()}if(c.dataset.submitted===true){alert("Form already submitted. Please wait.");return false}else{c.dataset.submitted=true}for(G=0;G<v.length;++G){v[G].setAttribute("disabled",true)}B();return true}}function A(){if(c!==null){return c.classList.contains("webform-client-form")||c.classList.contains("webform-submission-form")}return false}function k(){var D=d("div#card-element").closest("form").prop("id");if((typeof D==="undefined")||(!D.length)){D=d("input[name=hidden_processor]").closest("form").prop("id")}return document.getElementById(D)}function C(){var D=null;if(A()){D=c.querySelectorAll('[type="submit"].webform-submit');if(!D){D=c.querySelectorAll('[type="submit"].webform-button--submit')}}else{D=c.querySelectorAll('[type="submit"].validate')}return D}function s(){var D=0;if(a()){D=null}else{if(document.getElementById("totalTaxAmount")!==null){D=parseFloat(z());g("Calculated amount using internal calculateTaxAmount()")}else{if(typeof calculateTotalFee=="function"){D=parseFloat(calculateTotalFee())}else{if(A()){d(".line-item:visible","#wf-crm-billing-items").each(function(){D+=parseFloat(d(this).data("amount"))})}else{if(document.getElementById("total_amount")){D=parseFloat(document.getElementById("total_amount").value)}}}}}g("getTotalAmount: "+D);return D}function z(){var D=0;if(document.getElementById("totalTaxAmount")===null){return D}if(document.getElementById("totalTaxAmount").textContent.length===0){D=document.getElementById("total_amount").value}else{D=document.getElementById("totalTaxAmount").textContent.split(" ").pop()}return D}function h(){var D=false;if(A()){if(d('input[id$="contribution-installments"]').length!==0&&d('input[id$="contribution-installments"]').val()>1){D=true}}if(document.getElementById("is_recur")!==null){if(document.getElementById("is_recur").type=="hidden"){D=(document.getElementById("is_recur").value==1)}else{D=Boolean(document.getElementById("is_recur").checked)}}else{if(d('input[name="auto_renew"]').length!==0){if(d('input[name="auto_renew"]').prop("checked")){D=true}else{if(document.getElementById("auto_renew").type=="hidden"){D=(document.getElementById("auto_renew").value==1)}else{D=Boolean(document.getElementById("auto_renew").checked)}}}}g("isRecur is "+D);return D}function w(D){if(!D.complete){return}document.getElementById("billing_postal_code-"+CRM.vars.stripe.billingAddressID).value=D.value.postalCode}function o(){cividiscountElements=c.querySelectorAll("input#discountcode");var D=function(E){if(E.keyCode===13){E.preventDefault();g("adding submitdontprocess");c.dataset.submitdontprocess=true}};for(i=0;i<cividiscountElements.length;++i){cividiscountElements[i].addEventListener("keydown",D)}}function e(){d(".billing_name_address-section div.label span.crm-marker").each(function(){d(this).closest("div").next("div").children("input").addClass("required")})}function a(){if((document.getElementById("additional_participants")!==null)&&(document.getElementById("additional_participants").value.length!==0)){g("We don't know the final price - registering additional participants");return true}return false}function g(D){if((typeof(CRM.vars.stripe)==="undefined")||(Boolean(CRM.vars.stripe.jsDebug)===true)){console.log(new Date().toISOString()+" civicrm_stripe.js: "+D)}}function u(E){var D=null;if(document.getElementById("action")!==null){D=document.getElementById("action")}else{D=document.createElement("input")}D.setAttribute("type","hidden");D.setAttribute("name","op");D.setAttribute("id","action");D.setAttribute("value",E);c.appendChild(D)}function l(){if((typeof c==="undefined")||(!c)){c=k();if(!c){return null}}var D=c.querySelector('input[name="payment_processor_id"]:checked');if(D!==null){return parseInt(D.value)}return null}});
\ No newline at end of file