Add new error strings for credit cards.

donations/lib/src/main/java/org/signal/donations/CreditCardPaymentSource.kt

@@ -8,6 +8,7 @@ import org.json.JSONObject
 class CreditCardPaymentSource(
   private val payload: JSONObject
 ) : StripeApi.PaymentSource {
+  override val type = StripePaymentSourceType.CREDIT_CARD
   override fun parameterize(): JSONObject = payload
   override fun getTokenId(): String = parameterize().getString("id")
   override fun email(): String? = null

donations/lib/src/main/java/org/signal/donations/GooglePayPaymentSource.kt

@@ -4,6 +4,8 @@ import com.google.android.gms.wallet.PaymentData
 import org.json.JSONObject
 
 class GooglePayPaymentSource(private val paymentData: PaymentData) : StripeApi.PaymentSource {
+  override val type = StripePaymentSourceType.GOOGLE_PAY
+
   override fun parameterize(): JSONObject {
     val jsonData = JSONObject(paymentData.toJson())
     val paymentMethodJsonData = jsonData.getJSONObject("paymentMethodData")

donations/lib/src/main/java/org/signal/donations/StripeApi.kt

@@ -520,6 +520,7 @@ class StripeApi(
   ) : Parcelable
 
   interface PaymentSource {
+    val type: StripePaymentSourceType
     fun parameterize(): JSONObject
     fun getTokenId(): String
     fun email(): String?

donations/lib/src/main/java/org/signal/donations/StripePaymentSourceType.kt

@@ -0,0 +1,12 @@
+package org.signal.donations
+
+enum class StripePaymentSourceType(val code: String) {
+  CREDIT_CARD("credit_card"),
+  GOOGLE_PAY("google_pay");
+
+  companion object {
+    fun fromCode(code: String?): StripePaymentSourceType {
+      return values().firstOrNull { it.code == code } ?: GOOGLE_PAY
+    }
+  }
+}